This is absolutely fascinating and makes complete sense. We are told to take every thought captive and make it obedient to Christ. We are also told that we are to think of good things, lovely things, and what we think matters. I'm sure not all are demons and some may have something else going on, but I'd bet a lot are and at least everything this guy has seen has been since it's been so consistent across all the patients. Makes you really reconsider how hard you are on yourself and really need to try to stay positive.